| Autor: |
Yue, Zhongren, Benak, Kelly R., Wang, Jinwen, Mangun, Christian L., Economy, James |
| Zdroj: |
Journal of Materials Chemistry; 2005, Vol. 15 Issue: 30 p3142-3148, 7p |
| Abstrakt: |
ZnCl2-activated polyacrylonitrile (PAN) coated onto a fiberglass substrate was prepared in N2at 450 °C. The porous and chemical structures were characterized by using N2adsorption at 77 K, XPS, FTIR, competitive adsorption of CO2/CH4and the adsorption of Cs+, Sr2+and Ag+. The activated PAN displays a high BET surface area up to 1012 m2g−1, a broad mesopore size distribution as well as a major micropore size distribution. Up to 19.3 wt% of nitrogen, which is probably in the form of pyridinic and pyrrolic structures, is incorporated in the chemically activated PAN. HCl uptake results show that such a material has a higher amount of weakly basic functional groups compared to a commercially available ACF15. The activated PAN also exhibits a higher selectivity coefficient for CO2/CH4at STP and higher adsorption amounts for Cs+, Sr2+and Ag+than ACF15. It is proposed that nitrogen-containing, weakly basic functional groups positioned on the suitable-sized pore walls improve the adsorption ability of the activated PAN toward CO2, Cs+, Sr2+and Ag+. |
| Databáze: |
Supplemental Index |
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